Elastic-fluid turbine



STATE CHRISTIAN STEENSTRUP, OF SCHENECTADY, NEW YORK, ASSIGN OR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK."

ELASTIC-FLUID TURBINE.

Application-filed July 15,

To all whom it may concern:

Be it known that I, CHRISTIAN STEEN- srnor, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have lnvented certain new and useful Improvements in Elastic-Fuid Turbines, of which the following is a specification.

The presentinvention relates to elastic fluid turbines and particularly to turbines which employ rings of buckets carried by rotors, the outer ends of the buckets being provided with bucket covers fastened in place by tenons on the bucket ends.

During operation a bucket cover 1s subjected to stresses of great magnitude,,due to centrifugal force, to changes in temperature which cause expansion and contraction, and

also, particularly in the case of very long buckets, to vibrations and bending of the buckets between their ends in the direction of rotation which tends to buckle the bucket covers and puts greatstress on the holding tenons.

The object of my invention is to provide a new and improved structure and arrangement of tenons for holding bucket covers in place and for a consideration of what I believe to be novel and my invention attention is directed to the accompanying description and the claims appended thereto.

In the drawing, the figure is a side elevation partly in section of a part of a rotor having a ring of buckets provided with a bucket cover and tenons embodying my invention.

Referring to the drawing, 5 indicates a rotor, for example a wheel, drum or the like; 6 a ring of buckets mounted thereon and 7 a bucket cover. As is well understood, the bucket cover may be made in sections in the usual manner.

Now according to my invention, I provide the outer ends of the buckets with radially extending holes 8 which holes are flared outwardly at their outer ends as indicated at 9 and in such holes I fasten pins 10 which Specification of Letters Patent.

Patented Apr. 5,

1920. Serial No. 396,385. I

project beyond the ends 'of the buckets to form tenons. Pins 10 may be fastened in holes 8 by brazing, welding, or other suitable means. The outer ends of pins 10 pass through holes in bucket cover 7 in the usual manner and are upset to form heads 11 for holding the bucket cover.

VVith the above described arrangement it will be seen that due to the flared outer ends of holes 8, pins 10 may bend slightly when subjected to stresses and are, therefore, not likely to break off. If the bucket cover buckles slightly, or the wheel deforms or gets out of true due to any cause, the pins can take a position not strictly radial without difliculty. Furthermore with this arrangement I am enabled to make the pins of any suitable very strong material for they need not be of the same material as the buckets themselves.

In accordance with the provision of the patent statutes, I have described the princlple of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and the invention may be carried out by other means.

What I claim as new and, desire to secure by Letters Patent of the United States, is 2- 1, In an elastic fluid turbine, a rotor, a ring of buckets thereon, said buckets having flared holes in their outer ends, a bucket cover, and pins fastened in said holes and forming tenons for fastening the bucket cover in place. i

2. In an elasticfiuid turbine, a rotor, a

7 ring of buckets thereon, said buckets having holes in their ends the outer portions of which are flared outwardly, pins having their inner ends. fastened in said holes and a In witness whereof, I have hereunto set my hand this 14th day of July, 1920.

' CHRISTIAN STEENSTRUP. 

